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| All Patents in class 451/411 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,243,921 | Apr. 05, 1966 | D.E. Sutton | Mounting duplex tables on two rods | ||
| 4,133,423 | Jan. 09, 1979 | F. Zankl | Shuttle System for Machine Tool | metalworking machine mechanisms | |
| 4,607,459 | Aug. 26, 1986 | S.C. Rees | Combined hollow grinder, sharpener and honer | ||